a steel spring of spring constant 150 N/m is compressed from it's natural position through a mud wall 1m thick , the speed of bullet drops to 100 m/s. Calculate the average resistance of wall.Neglect friction of air.
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The magnitude of the work is
12kx2=12×(50Nm)×(1cx)212kx2=12×(50Nm)×(1cx)2
=(25Nm)×(1×10−2)2=2.5×10−3J=(25Nm)×(1×10-2)2=2.5×10-3J
As the compressed spring will push the agency, the force will be opposite to the displacement of the point of application and the work will be negative. Thus, the work done by the spring force is -2.5mJ.
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